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/*
* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/CPUTime.h>
#include <windows.h>
namespace WTF {
static Seconds fileTimeToSeconds(const FILETIME& fileTime)
{
// https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms683223(v=vs.85).aspx
// "All times are expressed using FILETIME data structures. Such a structure contains
// two 32-bit values that combine to form a 64-bit count of 100-nanosecond time units."
const constexpr double hundredsOfNanosecondsPerSecond = (1000.0 * 1000.0 * 1000.0) / 100.0;
// https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms724284(v=vs.85).aspx
// "It is not recommended that you add and subtract values from the FILETIME structure to obtain relative times.
// Instead, you should copy the low- and high-order parts of the file time to a ULARGE_INTEGER structure,
// perform 64-bit arithmetic on the QuadPart member, and copy the LowPart and HighPart members into the FILETIME structure."
ULARGE_INTEGER durationIn100NS;
memcpy(&durationIn100NS, &fileTime, sizeof(durationIn100NS));
return Seconds { durationIn100NS.QuadPart / hundredsOfNanosecondsPerSecond };
}
std::optional<CPUTime> CPUTime::get()
{
// https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms683223(v=vs.85).aspx
FILETIME creationTime;
FILETIME exitTime;
FILETIME kernelTime;
FILETIME userTime;
if (!::GetProcessTimes(::GetCurrentProcess(), &creationTime, &exitTime, &kernelTime, &userTime))
return std::nullopt;
return CPUTime { MonotonicTime::now(), fileTimeToSeconds(userTime), fileTimeToSeconds(kernelTime) };
}
Seconds CPUTime::forCurrentThread()
{
FILETIME userTime, kernelTime, creationTime, exitTime;
BOOL ret = GetThreadTimes(GetCurrentThread(), &creationTime, &exitTime, &kernelTime, &userTime);
RELEASE_ASSERT(ret);
return fileTimeToSeconds(userTime) + fileTimeToSeconds(kernelTime);
}
}